001: /*
002: * $RCSfile: QuantTypeSpec.java,v $
003: * $Revision: 1.1 $
004: * $Date: 2005/02/11 05:02:18 $
005: * $State: Exp $
006: *
007: * Class: QuantTypeSpec
008: *
009: * Description: Quantization type specifications
010: *
011: *
012: *
013: * COPYRIGHT:
014: *
015: * This software module was originally developed by Raphaël Grosbois and
016: * Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
017: * Askelöf (Ericsson Radio Systems AB); and Bertrand Berthelot, David
018: * Bouchard, Félix Henry, Gerard Mozelle and Patrice Onno (Canon Research
019: * Centre France S.A) in the course of development of the JPEG2000
020: * standard as specified by ISO/IEC 15444 (JPEG 2000 Standard). This
021: * software module is an implementation of a part of the JPEG 2000
022: * Standard. Swiss Federal Institute of Technology-EPFL, Ericsson Radio
023: * Systems AB and Canon Research Centre France S.A (collectively JJ2000
024: * Partners) agree not to assert against ISO/IEC and users of the JPEG
025: * 2000 Standard (Users) any of their rights under the copyright, not
026: * including other intellectual property rights, for this software module
027: * with respect to the usage by ISO/IEC and Users of this software module
028: * or modifications thereof for use in hardware or software products
029: * claiming conformance to the JPEG 2000 Standard. Those intending to use
030: * this software module in hardware or software products are advised that
031: * their use may infringe existing patents. The original developers of
032: * this software module, JJ2000 Partners and ISO/IEC assume no liability
033: * for use of this software module or modifications thereof. No license
034: * or right to this software module is granted for non JPEG 2000 Standard
035: * conforming products. JJ2000 Partners have full right to use this
036: * software module for his/her own purpose, assign or donate this
037: * software module to any third party and to inhibit third parties from
038: * using this software module for non JPEG 2000 Standard conforming
039: * products. This copyright notice must be included in all copies or
040: * derivative works of this software module.
041: *
042: * Copyright (c) 1999/2000 JJ2000 Partners.
043: * */
044: package jj2000.j2k.quantization;
045:
046: import jj2000.j2k.util.*;
047: import jj2000.j2k.*;
048:
049: import java.util.*;
050:
051: import com.sun.media.imageioimpl.plugins.jpeg2000.J2KImageWriteParamJava;
052:
053: /**
054: * This class extends ModuleSpec class in order to hold specifications about
055: * the quantization type to use in each tile-component. Supported quantization
056: * type are:<br>
057: *
058: * <ul>
059: * <li> Reversible (no quantization)</li>
060: * <li> Derived (the quantization step size is derived from the one of the
061: * LL-subband)</li>
062: * <li> Expounded (the quantization step size of each subband is signalled in
063: * the codestream headers) </li>
064: * </ul>
065: *
066: * @see ModuleSpec
067: * */
068: public class QuantTypeSpec extends ModuleSpec {
069:
070: /**
071: * Constructs an empty 'QuantTypeSpec' with specified number of tile and
072: * components. This constructor is called by the decoder.
073: *
074: * @param nt Number of tiles
075: *
076: * @param nc Number of components
077: *
078: * @param type the type of the specification module i.e. tile specific,
079: * component specific or both.
080: * */
081: public QuantTypeSpec(int nt, int nc, byte type) {
082: super (nt, nc, type);
083: }
084:
085: /**
086: * Constructs a new 'QuantTypeSpec' for the specified number of components
087: * and tiles and the arguments of "-Qtype" option. This constructor is
088: * called by the encoder.
089: *
090: * @param nt The number of tiles
091: *
092: * @param nc The number of components
093: *
094: * @param type the type of the specification module i.e. tile specific,
095: * component specific or both.
096: * */
097: public QuantTypeSpec(int nt, int nc, byte type,
098: J2KImageWriteParamJava wp, String values) {
099: super (nt, nc, type);
100:
101: if (values == null) {
102: if (wp.getLossless())
103: setDefault("reversible");
104: else
105: setDefault("expounded");
106: return;
107: }
108:
109: // XXX: need to define it
110: specified = values;
111: String param = values;
112: // Parse argument
113: StringTokenizer stk = new StringTokenizer(param);
114: String word; // current word
115: byte curSpecValType = SPEC_DEF; // Specification type of the
116: // current parameter
117: boolean[] tileSpec = null; // Tiles concerned by the specification
118: boolean[] compSpec = null; // Components concerned by the specification
119:
120: while (stk.hasMoreTokens()) {
121: word = stk.nextToken().toLowerCase();
122:
123: switch (word.charAt(0)) {
124: case 't': // Tiles specification
125: tileSpec = parseIdx(word, nTiles);
126: if (curSpecValType == SPEC_COMP_DEF) {
127: curSpecValType = SPEC_TILE_COMP;
128: } else {
129: curSpecValType = SPEC_TILE_DEF;
130: }
131: break;
132: case 'c': // Components specification
133: compSpec = parseIdx(word, nComp);
134: if (curSpecValType == SPEC_TILE_DEF) {
135: curSpecValType = SPEC_TILE_COMP;
136: } else
137: curSpecValType = SPEC_COMP_DEF;
138: break;
139: case 'r': // reversible specification
140: case 'd': // derived quantization step size specification
141: case 'e': // expounded quantization step size specification
142: if (!word.equalsIgnoreCase("reversible")
143: && !word.equalsIgnoreCase("derived")
144: && !word.equalsIgnoreCase("expounded"))
145: throw new IllegalArgumentException(
146: "Unknown parameter " + "for "
147: + "'-Qtype' option: " + word);
148:
149: if (wp.getLossless()
150: && (word.equalsIgnoreCase("derived") || word
151: .equalsIgnoreCase("expounded")))
152: throw new IllegalArgumentException(
153: "Cannot use non " + "reversible "
154: + "quantization with "
155: + "'-lossless' option");
156:
157: if (curSpecValType == SPEC_DEF) {
158: setDefault(word);
159: } else if (curSpecValType == SPEC_TILE_DEF) {
160: for (int i = tileSpec.length - 1; i >= 0; i--)
161: if (tileSpec[i]) {
162: setTileDef(i, word);
163: }
164: } else if (curSpecValType == SPEC_COMP_DEF) {
165: for (int i = compSpec.length - 1; i >= 0; i--)
166: if (compSpec[i]) {
167: setCompDef(i, word);
168: }
169: } else {
170: for (int i = tileSpec.length - 1; i >= 0; i--) {
171: for (int j = compSpec.length - 1; j >= 0; j--) {
172: if (tileSpec[i] && compSpec[j]) {
173: setTileCompVal(i, j, word);
174: }
175: }
176: }
177: }
178:
179: // Re-initialize
180: curSpecValType = SPEC_DEF;
181: tileSpec = null;
182: compSpec = null;
183: break;
184:
185: default:
186: throw new IllegalArgumentException(
187: "Unknown parameter for " + "'-Qtype' option: "
188: + word);
189: }
190: }
191:
192: // Check that default value has been specified
193: if (getDefault() == null) {
194: int ndefspec = 0;
195: for (int t = nt - 1; t >= 0; t--) {
196: for (int c = nc - 1; c >= 0; c--) {
197: if (specValType[t][c] == SPEC_DEF) {
198: ndefspec++;
199: }
200: }
201: }
202:
203: // If some tile-component have received no specification, it takes
204: // the default value
205: if (ndefspec != 0) {
206: if (wp.getLossless())
207: setDefault("reversible");
208: else
209: setDefault("expounded");
210: } else {
211: // All tile-component have been specified, takes the first
212: // tile-component value as default.
213: setDefault(getTileCompVal(0, 0));
214: switch (specValType[0][0]) {
215: case SPEC_TILE_DEF:
216: for (int c = nc - 1; c >= 0; c--) {
217: if (specValType[0][c] == SPEC_TILE_DEF)
218: specValType[0][c] = SPEC_DEF;
219: }
220: tileDef[0] = null;
221: break;
222: case SPEC_COMP_DEF:
223: for (int t = nt - 1; t >= 0; t--) {
224: if (specValType[t][0] == SPEC_COMP_DEF)
225: specValType[t][0] = SPEC_DEF;
226: }
227: compDef[0] = null;
228: break;
229: case SPEC_TILE_COMP:
230: specValType[0][0] = SPEC_DEF;
231: tileCompVal.put("t0c0", null);
232: break;
233: }
234: }
235: }
236: }
237:
238: /**
239: * Returns true if given tile-component uses derived quantization step
240: * size.
241: *
242: * @param t Tile index
243: *
244: * @param c Component index
245: *
246: * @return True if derived quantization step size
247: * */
248: public boolean isDerived(int t, int c) {
249: if (((String) getTileCompVal(t, c)).equals("derived"))
250: return true;
251: else
252: return false;
253: }
254:
255: /**
256: * Check the reversibility of the given tile-component.
257: *
258: * @param t The index of the tile
259: *
260: * @param c The index of the component
261: *
262: * @return Whether or not the tile-component is reversible
263: * */
264: public boolean isReversible(int t, int c) {
265: if (((String) getTileCompVal(t, c)).equals("reversible"))
266: return true;
267: else
268: return false;
269: }
270:
271: /**
272: * Check the reversibility of the whole image.
273: *
274: * @return Whether or not the whole image is reversible
275: * */
276: public boolean isFullyReversible() {
277: // The whole image is reversible if default specification is
278: // rev and no tile default, component default and
279: // tile-component value has been specificied
280: if (((String) getDefault()).equals("reversible")) {
281: for (int t = nTiles - 1; t >= 0; t--)
282: for (int c = nComp - 1; c >= 0; c--)
283: if (specValType[t][c] != SPEC_DEF)
284: return false;
285: return true;
286: }
287:
288: return false;
289: }
290:
291: /**
292: * Check the irreversibility of the whole image.
293: *
294: * @return Whether or not the whole image is reversible
295: * */
296: public boolean isFullyNonReversible() {
297: // The whole image is irreversible no tile-component is reversible
298: for (int t = nTiles - 1; t >= 0; t--)
299: for (int c = nComp - 1; c >= 0; c--)
300: if (((String) getSpec(t, c)).equals("reversible"))
301: return false;
302: return true;
303: }
304:
305: }
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